Rheological properties of high molecular weight (HMW) syndiotactic poly(vinyl alcohol) (PVA)/HMW atactic PVA blend solutions

Won Seok Lyoo; Jeong Hyun Yeum; Oh Wook Kwon; Dong Soo Shin; Sung Soo Han; Byoung Chul Kim; Han Yong Jeon; Seok Kyun Noh

doi:10.1002/app.24223

Rheological properties of high molecular weight (HMW) syndiotactic poly(vinyl alcohol) (PVA)/HMW atactic PVA blend solutions

Won Seok Lyoo, Jeong Hyun Yeum, Oh Wook Kwon, Dong Soo Shin, Sung Soo Han, Byoung Chul Kim, Han Yong Jeon, Seok Kyun Noh

Department of Biofibers and Biomaterials Science

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

Abstract

To identify the effect of blend ratios of syndiotacticity-rich poly(vinyl alcohol) (s-PVA)/atactic PVA (a-PVA) having similar number-average degrees of polymerization (P_n)s of 4000 and degrees of saponification (DS)s of 99.9% on the Rheological properties of s-PVA/a-PVA/water solutions, water-soluble s-PVA and a-PVA with different syndiotactic diad contents of 58.5 and 54.0%, respectively, were prepared by bulk copolymerization of vinyl pivalate and vinyl acetate (VAc) and solution polymerization of VAc, followed by saponifying the corresponding copoly(vinyl pivalate/vinyl acetate) and poly(vinyl acetate). The blend ratios played a significant role in theological behavior. Over the frequency range of 10^-1-10² rad/s, s-PVA/a-PVA blend solutions with larger s-PVA content show more shear thinning at similar (P_n)s and (DS)s of polymer, suggesting that PVA molecules are more readily oriented as s-PVA content increases. Yield stress is higher for s-PVA/a-PVA blend solutions with larger s-PVA content at similar (P _n)s and (DS)s of polymer. This indicates that more domains with internal order are produced at larger s-PVA content in s-PVA/a-PVA blend solutions.

Original language	English
Pages (from-to)	3934-3939
Number of pages	6
Journal	Journal of Applied Polymer Science
Volume	102
Issue number	4
DOIs	https://doi.org/10.1002/app.24223
State	Published - 15 Nov 2006

Keywords

a-PVA
Blend ratios
Rheological properties
s-PVA
Shear thinning

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10.1002/app.24223

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title = "Rheological properties of high molecular weight (HMW) syndiotactic poly(vinyl alcohol) (PVA)/HMW atactic PVA blend solutions",

abstract = "To identify the effect of blend ratios of syndiotacticity-rich poly(vinyl alcohol) (s-PVA)/atactic PVA (a-PVA) having similar number-average degrees of polymerization (Pn)s of 4000 and degrees of saponification (DS)s of 99.9% on the Rheological properties of s-PVA/a-PVA/water solutions, water-soluble s-PVA and a-PVA with different syndiotactic diad contents of 58.5 and 54.0%, respectively, were prepared by bulk copolymerization of vinyl pivalate and vinyl acetate (VAc) and solution polymerization of VAc, followed by saponifying the corresponding copoly(vinyl pivalate/vinyl acetate) and poly(vinyl acetate). The blend ratios played a significant role in theological behavior. Over the frequency range of 10-1-102 rad/s, s-PVA/a-PVA blend solutions with larger s-PVA content show more shear thinning at similar (Pn)s and (DS)s of polymer, suggesting that PVA molecules are more readily oriented as s-PVA content increases. Yield stress is higher for s-PVA/a-PVA blend solutions with larger s-PVA content at similar (P n)s and (DS)s of polymer. This indicates that more domains with internal order are produced at larger s-PVA content in s-PVA/a-PVA blend solutions.",

keywords = "a-PVA, Blend ratios, Rheological properties, s-PVA, Shear thinning",

author = "Lyoo, {Won Seok} and Yeum, {Jeong Hyun} and Kwon, {Oh Wook} and Shin, {Dong Soo} and Han, {Sung Soo} and Kim, {Byoung Chul} and Jeon, {Han Yong} and Noh, {Seok Kyun}",

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AU - Lyoo, Won Seok

AU - Yeum, Jeong Hyun

AU - Kwon, Oh Wook

AU - Shin, Dong Soo

AU - Han, Sung Soo

AU - Kim, Byoung Chul

AU - Jeon, Han Yong

AU - Noh, Seok Kyun

PY - 2006/11/15

Y1 - 2006/11/15

N2 - To identify the effect of blend ratios of syndiotacticity-rich poly(vinyl alcohol) (s-PVA)/atactic PVA (a-PVA) having similar number-average degrees of polymerization (Pn)s of 4000 and degrees of saponification (DS)s of 99.9% on the Rheological properties of s-PVA/a-PVA/water solutions, water-soluble s-PVA and a-PVA with different syndiotactic diad contents of 58.5 and 54.0%, respectively, were prepared by bulk copolymerization of vinyl pivalate and vinyl acetate (VAc) and solution polymerization of VAc, followed by saponifying the corresponding copoly(vinyl pivalate/vinyl acetate) and poly(vinyl acetate). The blend ratios played a significant role in theological behavior. Over the frequency range of 10-1-102 rad/s, s-PVA/a-PVA blend solutions with larger s-PVA content show more shear thinning at similar (Pn)s and (DS)s of polymer, suggesting that PVA molecules are more readily oriented as s-PVA content increases. Yield stress is higher for s-PVA/a-PVA blend solutions with larger s-PVA content at similar (P n)s and (DS)s of polymer. This indicates that more domains with internal order are produced at larger s-PVA content in s-PVA/a-PVA blend solutions.

AB - To identify the effect of blend ratios of syndiotacticity-rich poly(vinyl alcohol) (s-PVA)/atactic PVA (a-PVA) having similar number-average degrees of polymerization (Pn)s of 4000 and degrees of saponification (DS)s of 99.9% on the Rheological properties of s-PVA/a-PVA/water solutions, water-soluble s-PVA and a-PVA with different syndiotactic diad contents of 58.5 and 54.0%, respectively, were prepared by bulk copolymerization of vinyl pivalate and vinyl acetate (VAc) and solution polymerization of VAc, followed by saponifying the corresponding copoly(vinyl pivalate/vinyl acetate) and poly(vinyl acetate). The blend ratios played a significant role in theological behavior. Over the frequency range of 10-1-102 rad/s, s-PVA/a-PVA blend solutions with larger s-PVA content show more shear thinning at similar (Pn)s and (DS)s of polymer, suggesting that PVA molecules are more readily oriented as s-PVA content increases. Yield stress is higher for s-PVA/a-PVA blend solutions with larger s-PVA content at similar (P n)s and (DS)s of polymer. This indicates that more domains with internal order are produced at larger s-PVA content in s-PVA/a-PVA blend solutions.

KW - a-PVA

KW - Blend ratios

KW - Rheological properties

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KW - Shear thinning

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ER -

Rheological properties of high molecular weight (HMW) syndiotactic poly(vinyl alcohol) (PVA)/HMW atactic PVA blend solutions

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Keywords

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